package cn.tedu.sp06.filter;

import com.netflix.zuul.ZuulFilter;
import com.netflix.zuul.context.RequestContext;
import com.netflix.zuul.exception.ZuulException;
import org.apache.commons.lang3.StringUtils;
import org.springframework.cloud.netflix.zuul.filters.support.FilterConstants;
import org.springframework.stereotype.Component;

import javax.servlet.http.HttpServletRequest;

@Component
public class AccessFilter extends ZuulFilter {

    //设置过滤器的类型, pre(前置),routing,post,error
    @Override
    public String filterType() {
        //return "pre";
        return FilterConstants.POST_TYPE;
    }
    //位置序号
    //
    @Override
    public int filterOrder() {
        return 6;
    }
    //判断针对当前请求,是否执行过滤器代码
    @Override
    public boolean shouldFilter() {
        /*
        调用商品判断权限,
        调用用户和订单,不检查权限
         */

        //获得调用的服务id
        RequestContext ctx = RequestContext.getCurrentContext();
        String serviceId =(String) ctx.get(FilterConstants.SERVICE_ID_KEY);
        return "item-service".equals(serviceId);
    }
    //过滤代码
    @Override
    public Object run() throws ZuulException {
        //http://localhost:3001/item-service/t234324?token=agga
        //获得requst对象
        RequestContext ctx = RequestContext.getCurrentContext();
        HttpServletRequest request = ctx.getRequest();
        //接收token 参数
        String token = request.getParameter("token");
        //如果没有 token 阻止继续访问,直接返回响应
//        if (token=null||token.length()==0||token.trim().length()==0);
        if (StringUtils.isAllBlank(token)){
            //阻止继续访问
            ctx.setSendZuulResponse(false);
            //直接返回响应
            ctx.addZuulResponseHeader("Content-Type","Text/Html;charset=UTF-8");
            ctx.setResponseBody("Not Login!  未登录!");
        }
        //这个返回值不起任何作用,返回任何值都可以
        return null;
    }
}
